IMPs, like all other building materials, must meet the provisions of the building code in effect for the project and site under consideration. However, certain basic parameters listed in this specification are generally required for use on most commercial buildings in Canada. This document is therefore being presented by the IMP Alliance of the Metal Construction Association (MCA) as an aid for designers to assist them in construction of project specifications, notes and other contract documents.

The scope of this document is a typical low-rise (i.e., 3 stories or less) commercial building of non-hazard occupancy as identified by the National Building Code of Canada, where IMPs with polyisocyanurate or polyurethane cores are used as either a standing seam or through-fastened roofing system.